If the driver had started the engine and veered the steering wheel to the left , immediately after the crane lifted the back of the tanker, the lorry would have moved because of the mechanical advantage. By keeping the wheel turned to right, the energy from the lorry could not be harnessed. A job done imperfectly.
@@TruckoffRoads really sad. For loss of key, you called a crane. In the old days ambassador, they used to keep a rolled silver foil paper available in cigarette packets to Enable the circuit connection inside the bonnet and start the car.